论文标题
PBTE-COSB3散装多晶复合材料的导热率：微结构和界面热电阻的作用
Thermal conductivity of PbTe-CoSb3 bulk polycrystalline composite: the role of microstructure and interface thermal resistance
论文作者
论文摘要
介绍了有关微结构和界面热电阻对PBTE-COSB3散装多晶复合材料的导热性作用的系统实验和理论研究。特别地，讨论了分散相的粒径与声音热导率（κ_{ph}）上的分散相和界面热电阻（R_ {int}）之间的相关性。以此目的，制备了一系列具有不同粒径COSB_3的PBTE-COSB_3多晶复合材料。结构（XRD）和微结构分析（SEM/EDX）确认假定的化学和相组成。由PBTE和COSB_3相测得的声速确定声阻抗差（ΔZ）。接口热电阻（R_ {int}）使用Debye模型计算，并与实验R_ {INT}一致。结果表明，当分散相的粒径（COSB_3）小于〜230nm的临界值时，复合材料的κ_{ph}可以减少。这种关系得出结论对于控制复合热电材料中的热传输现象至关重要。与Kapitza半径相比，具有不同弹性性能（声阻抗）和粒径不同的组件的选择导致复合TE材料具有设计的热性能的新方向
Systematic experimental and theoretical research on the role of microstructure and interface thermal resistance on the thermal conductivity of the PbTe-CoSb3 bulk polycrystalline composite is presented. In particular, the correlation between the particle size of the dispersed phase and interface thermal resistance (R_{int}) on the phonon thermal conductivity (κ_{ph}) is discussed. With this aim, a series of PbTe-CoSb_3 polycrystalline composite materials with the different particle sizes of CoSb_3 was prepared. The structural (XRD) and microstructural analysis (SEM/EDXS) confirmed assumed chemical and phase compositions. The acoustic impedance difference (ΔZ) was determined from measured sound velocities in PbTe and CoSb_3 phases. The interface thermal resistance (R_{int}) was calculated using the Debye model and agrees with the experimental R_{int}. It is shown that the κ_{ph} of the composite may be reduced when the particle size of the dispersed phase (CoSb_3) is smaller than the critical value of ~230nm. This relationship was concluded to be crucial for controlling the heat transport phenomena in composite thermoelectric materials. The selection of the components with different elastic properties (acoustic impedance) and particle size smaller than the Kapitza radius leads to a new direction in the engineering of composite TE materials with designed thermal properties
